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(No Model.)

f P. O'CONNOR.

. STEAM BOILER.

Patented June 9, 1885.

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u 'Mo mw? a JNITED STATES ATENT OFFICE,

PATRICK O'CONNOR, OF MOUNT SAVAGE, MARYLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 319,842, dated June 9, 1885.

Application filcd April 6, 1885. (No model.)

To all whom, it may concernz:

Be it known that I, PATRIoK OtCoNNoR, a citizen of the United States, residing at Mount Savage, in the county of Alleghany and State of Maryland, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being had to the aecompanying drawings.

Thepresent invention relates to improvements in steam-generators; and it consists, essentially, in so constructing and arranging a horizontal boiler that the products of combustion Will be carried from the smoke-box underneath as well as through the lower part of the cylindrical portion of the boiler, and then back through an additional set of fiues, also contained With thecylindrical portions of the boiler, and into a smoke-box which is located above the fire-box, and so constructed as to be Wholly below the water-line, and

which is provided with a connection extend-.

ing to the shell of the boiler, to which the stack is connected. The Crown-sheet of the fire-boX and the lower portion of the smokebox are firmly united by suitable braces, which are employed, as usual, throughout the customary parts of the structure.

The general details'of construction and arrangement will be found hereinafter fully set forth.

In the drawings, Figure 1 is a sectional elevation of my improved boiler. Fig. 2 is a section on the line 2 2 of Fig. 1. Fig. 3 is a section on the line 3 3 of Fig. 1.

Similar letters denote like parts.

A represents the shell, and B the depending portion surrounding the fire-box, known as the water-leg. O is the fire-box, the opening thereinto being indicated at D. O' is the crown-sheet, which is curved upward to give greater strength. From the fire-box a number of ordinary-sized tubes, d, extend for- Ward to the back connection, E, and in order to more thoroughly heat this portion of the boilerand to attain the full effects of combustion, I provide an additional passage, F, from the fire-box underneath the boiler to the back connection, E.

A second set of fiues, e, return the products of combustion from the back connection, E, to the smoke-box G, which, it will be seen, is wholly within the boiler and below the water-line, and preferably of the same length and width as the fire-box, to which it is safely and securely fastened by stay-bolts in the well-known manner.

The smoke-box G connects with the shell A through the vertical passage g, and thence to the stack. It will thus be seen that my improved boiler is not only entirely self-contained, but that the heat is applied to it both inside and outside, and that by constructing thensmoke-box substantially as shown it is rendcred easily accessible` through the passage g in case repairs should be necessary.

The fire-box is provided with a water-grate, H, and in order to promote still greater economy of fuel the sheet f, inclosing the eXterior of the passage F, should be lined with non-conducting refraetory material f'. The opening into the space F is protected by a suitable casting, fz, as is usual in the case of the main opening D.

I have not considered it necessary to show the stay-bolts, as their use is too well understood to require more than reference thereto.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1. In a steam-boiler, the combination, with a fire-box, a set of fiues passing through the boiler, and an auxiliary passage extending from said fire-box below the boiler to the back connection, of a series of return-fiues, a smoke-box located above the fire-box and within the boiler, and a connection between said smoke-box and the shell, substantially as described.

.2. In a steam-boiler, the combination, with the shell A, having water-leg B, of the firebox O, the direct tubes B, and passage F, and the return-fiues e, smoke-box G, and suitableoutlet, substantially as shown and described.

3. In a steam-boiler, the combination, with the shell A, of the fire-boX O, having arched Crown-sheet C', direct fiues d, and auXiliary passage F, the return-fiues e, and the smokebox G, the lower portion of which corresponds in area to the Crown-sheet O', the entire structure being below the water-line, substantially as described.

In testimony whereof I hereto affix my signature in presence of A two witnesses.

Witnesses: PATRICK OlOONNOR.

W. O. HOFFMAN, R. W. MoMIoHAEL.

IOO 

